import time
import turtle

turtle.ht()
turtle.pensize(15)
turtle.goto(100, 0)
turtle.goto(100, -260)
turtle.goto(0, -260)
turtle.goto(0, 0)

time.sleep(3)
turtle.pencolor('red')
turtle.penup()
turtle.goto(50, -65)
turtle.pendown()
turtle.dot(40)

time.sleep(3)
turtle.pencolor('yellow')
turtle.penup()
turtle.goto(50, -130)
turtle.pendown()
turtle.dot(40)

time.sleep(3)
turtle.pencolor('green')
turtle.penup()
turtle.goto(50, -195)
turtle.pendown()
turtle.dot(40)

turtle.done()